D200 vs. PL-1, NEX or P&S

the nex lenses are still a little bulky to be called compact so it will still have a sizable profie underwater. the rumored nikon interchanable lens camera, if the patents are to be belived, may well be the most compact of the lot. small strobes will be a must but bouancy may need to be added. my 5 year old d200 flooded a few months back so i guess i'm not the only one looking into a replacement.